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\frac{x}{x+y}+\frac{x^{2}}{\left(x+y\right)\left(-x+y\right)}
Factor y^{2}-x^{2}.
\frac{x\left(-x+y\right)}{\left(x+y\right)\left(-x+y\right)}+\frac{x^{2}}{\left(x+y\right)\left(-x+y\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of x+y and \left(x+y\right)\left(-x+y\right) is \left(x+y\right)\left(-x+y\right). Multiply \frac{x}{x+y} times \frac{-x+y}{-x+y}.
\frac{x\left(-x+y\right)+x^{2}}{\left(x+y\right)\left(-x+y\right)}
Since \frac{x\left(-x+y\right)}{\left(x+y\right)\left(-x+y\right)} and \frac{x^{2}}{\left(x+y\right)\left(-x+y\right)} have the same denominator, add them by adding their numerators.
\frac{-x^{2}+xy+x^{2}}{\left(x+y\right)\left(-x+y\right)}
Do the multiplications in x\left(-x+y\right)+x^{2}.
\frac{xy}{\left(x+y\right)\left(-x+y\right)}
Combine like terms in -x^{2}+xy+x^{2}.
\frac{xy}{-x^{2}+y^{2}}
Expand \left(x+y\right)\left(-x+y\right).